The Mulholland Dam is a Los Angeles Department of Water and Power dam located in the Hollywood Hills of Los Angeles, California. The dam impounds the Hollywood Reservoir, holding 2.5 billion US gallons (9,500,000 m3) of water and is 183 feet (56 m) deep.
Mulholland Dam was named after its designer, William Mulholland, who was also responsible for the design of the aqueduct and other dams-reservoirs of the Los Angeles Aqueduct System, including the Saint Francis Dam. The Mulholland Dam was completed in 1924. It played a prominent role in the 1974 disaster film Earthquake, although it was named the "Hollywood Reservoir Dam" in the film. After a giant earthquake destroys much of Los Angeles, the dam threatens to collapse, which it does due to aftershocks, and floods Hollywood down to the Mid-Wilshire district of the city.